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A251783 Number of (n+2)X(n+2) 0..3 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 2 3 6 or 7 0
1280, 2640, 16710, 149364, 2432344, 52977162, 2223220200, 171503981892, 20081331006806, 3867096597138664, 1162903308152378970, 538715029223098678532 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A251791

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=4

..2..2..1..1..2..2....0..3..2..0..2..2....0..0..0..0..0..0....0..3..1..0..3..2

..3..3..3..3..3..3....1..3..1..0..3..1....2..2..1..1..2..2....3..1..0..3..1..0

..0..0..0..0..0..0....0..3..2..0..3..2....3..3..3..3..3..2....2..0..3..2..0..3

..1..2..1..2..1..2....0..3..1..0..3..1....0..0..0..0..0..1....0..3..2..0..3..2

..3..3..3..3..3..3....0..3..2..0..3..2....2..1..2..2..1..1....3..1..0..3..1..0

..0..0..0..0..0..0....1..3..1..0..3..1....3..3..3..3..3..3....2..0..3..1..0..3

CROSSREFS

Sequence in context: A251791 A251784 A234315 * A224645 A237953 A237236

Adjacent sequences:  A251780 A251781 A251782 * A251784 A251785 A251786

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 08 2014

STATUS

approved

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Last modified January 27 15:14 EST 2020. Contains 331295 sequences. (Running on oeis4.)